Description

Dump the contents of the filesystem to stdout in a “dump file” portable format, sending feedback to stderr. Dump revisions LOWER rev through UPPER rev. If no revisions are given, dump all revision trees. If only LOWER is given, dump that one revision tree. See the section called “Migrating Repository Data Elsewhere” for a practical use.

By default, the Subversion dump stream contains a single revision (the first revision in the requested revision range) in which every file and directory in the repository in that revision is presented as though that whole tree was added at once, followed by other revisions (the remainder of the revisions in the requested range), which contain only the files and directories that were modified in those revisions. For a modified file, the complete full-text representation of its contents, as well as all of its properties, are presented in the dump file; for a directory, all of its properties are presented.

Two useful options modify the dump file generator's behavior. The first is the --incremental option, which simply causes that first revision in the dump stream to contain only the files and directories modified in that revision, instead of being presented as the addition of a new tree, and in exactly the same way that every other revision in the dump file is presented. This is useful for generating a relatively small dump file to be loaded into another repository that already has the files and directories that exist in the original repository.

The second useful option is --deltas. This option causes svnadmin dump to, instead of emitting full-text representations of file contents and property lists, emit only deltas of those items against their previous versions. This reduces (in some cases, drastically) the size of the dump file that svnadmin dump creates. There are, however, disadvantages to using this option—deltified dump files are more CPU-intensive to create and tend not to compress as well as their nondeltified counterparts when using third-party tools such as gzip and bzip2.

	Tip
	Beginning with Subversion 1.8, svndumpfilter can operate on deltified dump streams. Prior to this release, svndumpfilter would not work with dump streams created using --deltas option.

Options

--deltas
--incremental
--memory-cache-size (-M) ARG
--quiet (-q)
--revision (-r) ARG

Examples

Dump your whole repository:

$ svnadmin dump /var/svn/repos > full.dump
* Dumped revision 0.
* Dumped revision 1.
* Dumped revision 2.
…

Incrementally dump a single transaction from your repository:

$ svnadmin dump /var/svn/repos -r 21 --incremental > incr.dump
* Dumped revision 21.